Integrated quality ­assurance from the quarry to the raw meal silo

If lime, marl and clay from different sources in variable quality and alternative raw materials are fed to a mixing process, a specific strategy for the mix-bed structure and in controlling the material composition before the mill is required. ABB there has such a system, which is presented in the following.

1 Introduction

Highly variable material in the quarries, the usage of alternative raw materials (for instance fly ashes and sewage sludges) as well as the cost pressure regarding the employed corrective materials: these factors total up to form a complex set of tasks when manufacturing raw meal for the production of cement clinker. This situation calls for the use of integrated mixture control concepts starting in the quarry control the blending bed stacking and assure minimum standard deviation of the lime standard and other moduli upstream of the mill and in the material taken from the...

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